If you ran the 15K or 5K in 2015 (and finished in the allotted time), you're eligible for early access, which starts at noon March 10. Running the 5K in 2015 doesn't get you early access for the 15K in 2016; the early access exists only for the distance you ran in 2015. The early access window shuts at noon on March 18.

If you registered in 2015 and deferred, you, too, have early access. The same rules apply: the window opens at noon March 10 and shuts at noon on March 18. After that, the deferral is null.

Everyone else can register beginning at noon March 19.

Registration will close when 14,000 sign up for the 15K and 4,500 sign up for the 5K.

Runners must be able to finish the 15K in 2 hours and 30 minutes, or the 5K in 45 minutes.